The Medford Chess Club invites you to drop by its new meeting location — the gazebo outside the Medford Housing Authority's Saltonstall Building on Riverside Avenue — for a friendly game of chess. The club has chess sets, chess clocks, and helpful members who are willing to teach you the rules if you're new to the game. There are no membership dues or fees to play.  If the weather is rainy, the club will meet at Colleen's of Medford Square…